Merge remote-tracking branch 'upstream/master' into show-status-from-branch

* upstream/master: (65 commits)
  Fixed typo in css class
  Merge branch 'airat/gitlab-ce-23268-fix-milestones-filtering' into 'master'
  Escape quotes in gl_dropdown values to prevent exceptions
  Fixes various errors when adding deploy keys caused by not exiting the control flow.
  Fix typo on /help/ui to Alerts section
  Grapify tags API
  Add 8.13.1 CHANGELOG entries
  Fix sidekiq stats in admin area
  Remove use of wait_for_ajax since jQuery was removed
  Specify which Fog storage drivers are imported by default in backup_restore.md
  Moved avatar infront of labels
  Don't schedule ProjectCacheWorker unless needed
  Fixed height of sidebar causing scrolling issues
  Reduce overhead of LabelFinder by avoiding #presence call
  Fixed users profile link in sidebar Fixed new labels not being created
  Improve redis config tasks for migration paths job
  Ensure search val is defined.
  Ensure cursor is applied to end of issues search input.
  Increase debounce wait on issues search execution.
  Keep the new resque.yml aside and use it once we've checked out master
  ...